Rotary-shuttle sewing-machine



'(No Model.)

4 Sheets-Sheet 1. F. T. LEILICH.

ROTARY SHUTTLE SEWING MACHINE.

` No. 97,652. Patnted 11910.12, 1889.

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4 Sheets-Sheet 2. F. T. LEILICH.`

.ROTARY SHUTTLE SEWING MAGHINE.

(Hummel.)

r l No. 397,652. Patented eb. 12, 1889.

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(No Model.) l

F. T, LEILICH.

ROTARY SHUTTLE SEWING MACHINE.

No. 397,652. Patented Teb. 12, 1889.;

Nv PENZRS` Phomiirhegmpher. washngmm D. C,

(No Model.)

` 4 Sheets-Sheet 4* F. T. LEILIGH.

ROTARY SHUTTLE SEWING MACHINE.

No. 397,652. Patented Feb. 12, 1889.

llirnn trarne Partnr trice.

FRANCIS T. LEILIUH, OF BRIDGEPORT, CONNECTICUT.

ROTARY-SHUTTLE SEWING-h/iACl-HNE.

SPECIFICATION forming part of Letters Patent No. 397,652, dated February 12, 1889.

Application led October 8, 1885. Renewed February 25, 1888. Serial No. 265,308. (No model.)

To all 1072/0171/ it 71mg/ concern:

Be it known that 1, FnliNcIs T. T.Eimcn, a citizen of the United States, residing at Bridgeport, in the county of Fairfield and State of Connecticut, have invented certain new and useful Improvements in Rotary-Shuttle Sewing-Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to certain new and useful improvements in sewirig-machines, but more especially to lock-stitch machines, in which the locking of the stitch is effected by means of a rotary shuttle carrying the under thread.

rlhe object of my invention is to furnish a sewing-machine which shall be simple in construction, positive in action, easy of adjustment, and with friction and wear and tear reduced to a minimum, but particularly to furnish, in combination with the other elements of construction, a system and mechanism for the driving of the shuttle at variable speed which will bc entirely positive, whose bearing upon the shuttle shall be constant, and which will in operation insure a perfectly free passage for the loop between the shuttle and its driver, thcreliiy avoiding any friction upon or abrasion of the thread, and with these ends in view my invention consists in the details of construction and combination of elements hereinafter fully explained, and then recited in the claims.

In order that those skilled in the art to which my invention appertains may fully understand its construction, l will describe the same in detail, referring` by. letter to the accompanying drawings, forming a part of this specilication, in which-a Figurc l a sectional elevation of my machine, the arm-head, bed, and the shuttle and its race beingsectioned and the mechanism in eleva-tion Fig. 2, a bottom view 5 Fig. 3, a front elevation; Fig. 4, a detail. plan view of the shuttle and its racc; Fi 5, a transverse vertical section of the arm and bed, showing the working parts in elevation; Fig. G, a detail section of the shuttle-race, showing the nonmetallic bearings; and Fig. 7, a partial plan view of the shuttle-race.

Similar letters denote like parts in the several figures of the drawings.

A is the bed-plate of the machine, and B the hollow curved arm supported upon the end of bed-plate A.

C is the head, preferably formed integral with the outer end of the arm. Held in guides within the head is a vertical needle-bar, D, carrying a short straight needle,

E is the main shaft of the machine supported and adapted to turn freely in journalbearings formed in the arm. Atone end of the shaft is a fast pulley, F, and hand-wheel G, 0f any ordinary construction, and at the other end a crank-disk, H, which is connected tothe needle-bar by a pivoted link, l. Peripherical cam-groove J', cut in the crank-disk, serves to give motion to the take-up K,whose short arm pivotally attached to the inside of the head by screw L, and whose elbow is provided with a slide or roller traveling in the cam-groove. The long arm protrudes through a slot in the outer face of the head, as seen at Fig. l. The arrangement of takeup and cam-groove is such as to properly time the reciprocation of the former relative to the throw of the needle-bar.

M N are a pair of beveled gears rigidly mounted, the former on shaft E, the latter upon the upper end of a vertical shaft, 0, journaled in bearings formed in lugs a b, cast on the inside of the arm. Shaft O, by means of the gears just described, receives a one-toone motion from shaft E and at right angles thereto.

P is a disk screwed or otherwise firmly secured lupon the lower end of shaft O and adapted to revolve therewith, and Q is aleverpitman pivotally attached to the bottom face of said disk by means of 'screw R, passed through boss S and threaded into the disk.

Cast upon the bottom face of the bed-plate is a downwardly-projecting lug, T, to whose extremity is pivoted a fulcrum-bearing composed of a grooved plate, U, and fiat plate V, screwed thereto. The pitman Q is retained in this bearing, and is adapted to have both a longitudinal and an oscillatory movement therein, for the purpose presently explained.

lV is'a crank-disk, and X is a short link pitTn otaily screwed both te the disk and to the extremity of the pitman.

IOO

Y s the shuttle-race, seen at Fig. l as secured to the bed-plate by screws Z, but which.

may, if desired, be cast integral. with the bedplate, and A is a short shaft extending 5 through the bottom et the race-casting, flanged to holdit in position and rigidly h eld to crank,- disk lV, as by a screw passed from beneath the latter and tapped into the metal ot' the shaft. At B an upturned cam-surface circuio lar in plan view, but whose surface inclination is shown at Fig. (i, is formed in the lower portion of the shuttle-race concentric with shaft A.

Pivoted between upwardly-prejeeting ears C' on top ofthe short shaft A is the shuttledriver D', engaging upon either side of its pivotal point with the cam-surface B. This, as will be readily understood, allows the driver an oscillation. on its pivot, imparted to it by zo the cam-surface, in addition to its rotation with the shaft A.

E is the shuttle, segmental in face outline, having a curved rib, M2, extending from the heel and joined to the rim behind the shnttle- 2 5 point, and the shuttle-web ll", secured beneath at three points on the rim to l'orm a base for the shuttle-hub G and a support for the bobbin. In either side of the shuttle, inside its periphery and at one hundred and eighty degrees from one another, are two recesses, ll',

within which the points of the driver are adapted to project, as seen at Fig. `I.

l' is the point of the shuttle, which takes on the loop from the needle.

A large bobbin and bobbin-case of ordinary construction for holding the under thread are held in assembled position upon the hub G. As this bobbin and case are ot ordinary construction and form no part of my invention, I 4o have not deemed it necessary to show them in the drawings. The bobbin. is perfectly free on its bearing, while the shuttle revolves around it, and. its case held against rotation by the draft of the lower thread to the cloth and a bifureated spring-finger, l, pivoted to the bed-plate. The rim o'l' shuttle vE' has a bearing and runs upon a flange, N, formed near the top of the race-casting and pierced at a point immediately beneath the needle-bar, so

5o as to leave the latter a Afree passage. The shuttle is retained in place by a cap-plate, O', screwed or otherwise secured on the top of the race, and which slightly overlaps the edge of the shuttle, but which. is interrupted be- 5 5 neath the path of the needle.

Around the upper edge olf the shuttle-race is drilled a series of holes yextemling down-- Y ward through thc casting, and with their peripheries cutting the periphery ol' the race ffo throughout the whole height ol' its side wall'.

They are drilled at an angle of (approximately) forty-five degrees, and are so spaced each Yfrom the next that the vertical. plane ot' the bottom of the iirst is slightly in advance 6; of the vertical plane of the top of the second.

The same result may, however, be substantially attained by drilling the holes vert-ical the bobbin, threading, and the like, and K2 is y a spring presser-footot an y ordinary construetion, having bar J2 held in guides in the head, and having an y usual lifter, lfor raising the same.

The feeding of the goods in my improve-V ment l accomplish by means of mechanism arranged as follows: A peripherical cam, R', is secured onv the shaft E, forward ot' the pulley and within the arm, and a bell-crank lever, S', is pivoted at its angle to the lug c inside ot" said arm. The upper .member of the lever is provided with a slide-roller or shoe resting in the groove ol' the cam and adapted to be operated thereby. The lower member of the lever is grooved in the are ot' a circle Afor the reception of a stud upon the upper extremity of a connecting-rod, T', whose vertical throw is determined and varied by means of a pivoted transverse link, U', regulated by a setscrew, V', binding on a slot cut in the arm oi' the machine. The lower extremity ot the connecting-rod is connected by a ball-joint to a short arm, lV', rigidly attached to a rockshaft, X', secured in cone-bearings passed through lugs e f, cast on the bottoni of the bed-plate. Near its other end the rock-shaft is provided with a second rigid arm, Y', at right angles to the first, and in the extremity otl arm Y is pivota-lly secured a feed-bar, Z', upon whose upper surface the feed dog A2 is mounted. A cam-groove, l?, eccentric to and cut in the face ol' the disk l, givesmovement to a curved lever, (l2, whose free end, having a roller or stud, runs therein, and whose other end is pivoted tothe bottom surface otl the bed-plate. liar D'2 is pivotally secured to lcvver C2 near its center, and extending beneath the bed-plate is supported. upon a bracket, E?, movably attached to the bed-plate by a setscrew and slot connection. The upper snrface of the bracket is inclined from right to left and the free end ot` bar l)2 :from left to 'I right, thus forming two contiguous inclined surfaces, the upper of which will, by, longitudinal motion ofi the bar, ride up upon. the lower. The set-screw and slot connection just referred to determines and variesthc eX- tent of l'iearing of the inclined surfaces, and thus obviously varies the vertical throw ol' the feed-dog. lfced-dog bai-Z' extends across beneath the bedplate, passingln'ftween guides il?, and its end rests upon the bar l)2 just inside the bracket.

The operation ot' my machine when constructed as aforesaid is as follows: By the ordinary belt common to sewing-machines ro- TOO IIO

:senese i tary motion is imparted to the shaft E, and t-herethrough by the crank-disk and link vertical reciprocation of the needle-bar is etfected. The upper thread is taken from an ordinary spool set upon a spindle, F2, on top ot the arm, and passes through guides g to tension G2, thence to the take-up, and thence through guides g to the needle-eye, through which it threads from let't to right. The oneto-one motion given by the shaft E through the gears to shaft O, and consequently to the disk I), is, through the medium ot' the pitman working in .its oscillating,fulerunn imparted to the crank-disk IV; but by the arrangement of pitman, tulcrum, and crank-disk the rotary traverse of the latter is made at a speed i which varies at ditterent points of revolution. The rotary motion of the crank-disk communieated to the shuttle by means of the driver, whose points enter the recesses in the shuttle and drive it around. The two points ot' the driver when in a position at right angles to the vertical plane of the arm are both in engagement with the shuttle, each in its recess. As the shaft A rotates, one arm of the driver is, by the cam-surface in the race, caused to rise in its recess and the other to drop awayl'xom its recess until the position shown at Fig. l is reached, when the top arm gradually recedes and the lower arm correspondingly rises until both are at last in engagement, when the operation `just described is repeated. The shuttle rotates within the race in the direction indicated by the arrow in liig. et. The rotation otl the shuttleis so timed by its relation to the pitman and shat't that it will take on the loop while traveling' at about its average speed, and the spreading of the loop by the shuttle is accomplished while the latter is moving with greatest rapidity. The loop, when taken on, slips backward into the recess behind the point formed by the juncture ol' the curved rib` M2 with the rim of the shuttle, and is thereby drawn forward and spread open by the advancing shuttle, by which it is dis charged atterthe back of the loop has passed a point one hundred and eighty degrees trom the needle-bar. The catching of theloop upon the driver during its passage around the shuttle is avoided bythe timing ot the former, which at the time of taking the loop is driving by the recess nearest the heel oi' the shuttle, and which at the time ot' the passage oi' said loop around the body ol the shuttle is drivin l iy the recess nearest the point thereof. This timing oi the driver is controlled by the direction ol' the inclination ot' the cam-surface. After the loop has been carried around and the bobbin has passed through the same, it is drawn upward by the take-up, thereby pulling the stitch iight `in the fabric. In the passage ot' the loop over the shuttle the f cloth side ot' the loop passes over the top ot the l shuttle, and the needle side beneath. This allows the draw upon the thread incident to the spreadingol the loop to be directly downward from the needle as the thread passes under the smootlrbellied bottom ot' the web, and the loop does not'in its passage contract any twist or kink whatever, whereby the thread may be broken at high speeds. In its rotation, as the turn oit the loop is held in the recess behind the point, it is obvious that it does not bear at any time upon the narrow flange on which the shuttle runs, but only slips over the smooth under surface of the web.

complished by the reciprocation of its bar by means of the rock-shaft X', receiving motion from the short arm IV', connecting-rod T', bell-crank lever S', and cam R on the main sha t't. Its horizontal throw is varied by the slide-link and set-screw holding the upper end ot the connecting-rml nearer to or tarther ;trom the heel end ci.' the lower member of the bell-crank lever in the groove cut there in. The vertical throw is accomplished by the overriding of the inclined surface ot' bar D2 upon the inclined upper surface on bracket E2, and the throw just mentioned may be varied at will by moving the said bracket by its screw, so that the surfaces will override farther or less tar during the longitudinal reciproca-tions ot the bar D2. erse ot' the Vfeed-dog is made against the resiliency of a spring, L2, (seen at Fig. 3,) which returns the feed-bar to its lowest plane when permitted by the cams.

In my invention I do not wish to be understood as laying claim, broadly, to a rotary shuttle driven at variable speed; neither do I claim the broad idea of the mechanism used for imparting variable motion to the driver-- shatt, `t'or I am aware that its equivalent has heretofore been employed; but I do not wish to be confined in my construct-imi to thc exact combination ot elements shown and described t'or the drivingl ot' the shuttle nor to the exact position ot' the driver-recesses therein, for it is obvious that the vertical oscillation can b e accomplished by a cam-groove in the race or by any slight variation in the contour ol' the t'aceecam which I have seen tit to employ, and that without (leparting from the spirit ot' my invention the position ot' the recesses might be somewhat changed. In the operation ot' my t'eed mechanism I do not desire to conline myself to the operation ot the curved lever C2 in a canrgroove cut in disk I), for I can readily, il desired, impart movement to said lever from a separate cam-disk on the vertical shaft.

Having thus described my invention, what I claim as new,a1id desire to secure by Iletters Patent, is-

l. In a sewing-machine of the character described, the combination, Vwith the needle, the needle-bar, and the main shal't and crank-connection for producing a vertical reciprocation therein, ot' the horizontal rotary shuttle provided. with driver-recesses, as described, the pivoted shuttledrver, the cam-surface The upward trav-V formed within the race-casting, the driver shaft and Vertical connecting-shaft, the disks secured upon said driver-shaft and vertical shaft, and the tra-nsversely-oscillating leverpitinan connectiiig said disks and adapted to effect in the driver-shaft a variably-spceded rotary motion, substantially as set forth.

2. In a sewing-machine, the Combination of the niain shaft, the needle-bar, and the needle carried thereby, the vertical shaft geared to the main shaft, the transversely-oscillating lever-pitman and the disks at either end thereof, the horizontal rotary shuttle, the cainsurface formed wit-hin the race, the vertical driver-shaft, `and the twoarmed shuttledriver pivoted upon its upper extremity, the latter adapted to drive the shuttle and to receive a variablyspeeded rotary motion from the driver-shaft and a vertical oscillation from the contour of the cam-su rface, substantially as shown and described.

AIn a sewingmachine ot tho character de scribed, the combination ot the horizontal rotary shuttle, the circular shuttle race, the cam surlace within the latter, thc variabllvspeeded vertical drivcr-shartt, and the twoarnied shuttle driver [Viiv'otally mounted thereon, the verticallyre '.iprocatin needle bar and needle, the main. shalt journalcd in the arni and its link-connection with the necdle-bar, the cam-actuated take-up lever operated from the shaft, and the mecl'ianisim as shown, for imparting,` the variable rotation lo the driver-shaft, whereby each loop is thrown, opened, castot'l", and drawn tight in the laln'ic before the com menceincnt ol another stitch,

substantially as specilicd.

al. The combination ot the main shatt, the `grooved cam mountedthereon,the bell-crank lever pivoted within the arm and actuated by the cani, the vertical Conner-'ling-rod adjustably secured lo the bell-crank, ihothumhnut binding on the arm and securing' the connecting-rod in its adjustment, the rcck-shal't pivoted beneath an d extcinl i ng' llon g'itudinall)Y ot the bed plaic, and the arms mounted thereon, the curved and pivoted lever, the connecting-rod, the inclined and adjustable bracket, and the feed-bar pivoted to the vertical rock-arm and with its free end resting` upon the bar D2, all arranged as described, and i'or the purpose spccilied.

5. The combination, with the main shaft and the needle-bar carried thereby, of the peripherical cam fixed thereon, the pivoted bellcrank lever, the vertically reciprocated connecting-rod, the rock-shaft operated thereby, the transverse feed-bar actuated by said rockshai't, the cam-actuated pivoted lever, and the longitudinally-reciprocating` bar inclined at its i'ree end, and the inclined adjustable bracket engaging with the incline on the bar upon which the free end of the 'teedbar rests, all arranged as described and adapted to give to the 'feed-dog both a to-and-fro movement and a vertical throw, substantially as set forth.

l. The combina-tion, in a rotary-shuttle sewing-machine, with the main shaft, of the bellcrank lever and the cam on said main shaft, whereby it is actuated, the vertical connectin `Q-rod, the rock-shaft and the arms upon the latter, the curved and pivoted lever, the bar at righ t an gies thereto, said bar having an inclined surface thereon, and the feed-bar pivotally attached to the rock-shaft arm and resting,r upon the bar D2, all arranged as and tor the purpose specified. 

